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Dielectric Response of Kraft Paper from Fibres Modified by Silica Nanoparticles
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology.
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.ORCID iD: 0000-0002-4800-9990
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Fibre Technology. KTH, School of Chemical Science and Engineering (CHE), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0001-8622-0386
2015 (English)In: 2015 IEEE CONFERENCE ON ELECTRICAL INSULATION AND DIELECTRIC PHENOMENA (CEIDP), IEEE conference proceedings, 2015, 459-462 p.Conference paper, Published paper (Refereed)
Resource type
Text
Abstract [en]

Papers have been prepared from fibres that were modified by physical adsorption of silica nanoparticles. Cationic and anionic nanoparticles were adsorbed either directly onto wood fibres or using the layer-by-Iayer (LbL) technique where silica nanoparticles and a polyelectrolyte of opposite charge were adsorbed in consecutive layers. It was shown that it is possible to tailor the dielectric and mechanical properties of kraft paper by utilizing the pH-dependence of the charge density of both the nanoparticles and the polyelectrolyte during the build-up of layers onto wood fibres. With only one layer of cationic silica nanoparticles, 6.0 wt% of nanoparticles were adsorbed at pH 6, leading to almost complete coverage of the wood fibre surface, resulting in a paper with low dielectric losses and improved in-plane tensile properties.

Place, publisher, year, edition, pages
IEEE conference proceedings, 2015. 459-462 p.
Series
Conference on Electrical Insulation and Dielectric Phenomena Annual Report, ISSN 0084-9162
Keyword [en]
silica nanoparticles, kraft-paper, electrical insulation, dielectric response
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-183709DOI: 10.1109/CEIDP.2015.7351987ISI: 000370070700094Scopus ID: 2-s2.0-84959555822ISBN: 978-1-4673-7498-9 (print)OAI: oai:DiVA.org:kth-183709DiVA: diva2:912943
Conference
IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), OCT 18-21, 2015, Ann Arbor, MI
Note

QC 20160318

Available from: 2016-03-18 Created: 2016-03-18 Last updated: 2017-04-20Bibliographically approved
In thesis
1. Cellulose-based electrical insulation materials: Dielectric and mechanical properties
Open this publication in new window or tab >>Cellulose-based electrical insulation materials: Dielectric and mechanical properties
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The reliability of the generation and distribution of electricity is highly dependent on electrical insulation and is essential for the prosperity of our society and a ubiquitous part of our everyday life. The present study shows how some important material properties affect the electrical properties of cellulose-based electrical insulation systems which are used together with mineral oil in high-voltage transformers. Among other things, the effects of paper density and of the lignin content of the fibres on the dielectric response and charge transport of the papers have been studied.

The underlying mechanisms of the inception and propagation of streamers, responsible for the most costly failures in transformers, at the oil-solid interface have been investigated and the important role of paper morphology on streamer propagation has been demonstrated. It was also shown that for polymers with permittivities close to that of the oil, the inception voltage was higher than with polymers with higher permittivities.

Fibres were also modified prior to paper sheet preparation in attempts to improve the mechanical and dielectric properties. The properties of papers containing cellulosic micro- and nanofibrils and SiO2 and ZnO nanoparticles indicate that these additives can indeed be used to improve both the mechanical and dielectric properties. For example, a three-layered structure with two papers laminated together with a thin layer of microfibrillated cellulose also showed an increased DC breakdown strength by 47 % compared to a single-layer paper with a similar thickness.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2017. 63 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2017:21
Keyword
cellulose, dielectric materials, electrical insulation, nanocellulose, nanoparticles, streamer
National Category
Polymer Technologies
Research subject
Fibre and Polymer Science
Identifiers
urn:nbn:se:kth:diva-205622 (URN)978-91-7729-327-9 (ISBN)
Public defence
2017-05-12, F3, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20170420

Available from: 2017-04-20 Created: 2017-04-20 Last updated: 2017-04-25Bibliographically approved

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